坦桑尼亚近海大陆边缘的晚新生代大规模迁移沉积

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

由于其经济和地质灾害潜力,沉积物大规模移动及其相关的大规模迁移矿床(MTDs)已被广泛研究。本研究将二维和三维地震反射数据与地震剖面方法和属性分析相结合,揭示了坦桑尼亚近海最南端地区不同 MTD 的存在和分布情况。地震剖面分析结果表明,研究区域包含不同的晚新生代 MTD。这些 MTD 的石油储藏潜力有限,包括滑坡、坍塌、泥石流沉积和偶尔出现的浊积岩。这些 MTD 的形成是与东非大裂谷系统发展相关的构造事件造成的。地震属性图显示了河道、残留块体、顶壁疤痕和沟槽的位置,证实了下坡沉积物的移动。海底属性图显示了最近开始大规模移动的区域。其中一些区域与剖开海床的断层相吻合,形成了潜在的未来重力破坏点。其他未来的重力崩塌点包括河道堤岸和斜坡边缘,可能存在于整个坦桑尼亚大陆边缘。沉积物的移动可能会造成灾难性后果,因此该地区未来的基础设施建设必须对海底进行详细测绘,以评估地质灾害风险并采取相应行动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Late Cenozoic mass transport deposits in the offshore Tanzania continental margin

Sediment mass movements and their associated Mass Transport Deposits (MTDs) have been widely studied due to their economic and geohazard potentials. This study combines 2D and 3D seismic reflection data with a seismic facies approach and attribute analysis to reveal the presence and distribution of different MTDs in the southernmost region offshore Tanzania. Results of seismic facies analysis show that the study area contains different Late Cenozoic MTDs. The MTDs have limited petroleum reservoir potential and include slides, slumps, debris flow deposits and occasional turbidites. The formation of these MTDs was caused by tectonic events associated with the development of the East African Rift System. Seismic attribute maps have shown the locations of channels, remnant blocks, headwall scars, and grooves confirming downslope sediment mass mobilization. The seabed attribute maps have shown areas where recent mass mobilizations were initiated. Some of these areas coincide with faults which have dissected the seabed, forming potential future gravity failure sites. Other future gravity failure sites include channel banks and slope edges, which may be present over the whole Tanzania continental margin. Sediment mass movements may be catastrophic, and therefore future infrastructure installations in the area must involve detailed mapping of the seabed to assess geohazard risks and act accordingly.

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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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